EP1911486B1 - Spring clip as needle tip protection for a safety IV catheter - Google Patents
Spring clip as needle tip protection for a safety IV catheter Download PDFInfo
- Publication number
- EP1911486B1 EP1911486B1 EP08000914A EP08000914A EP1911486B1 EP 1911486 B1 EP1911486 B1 EP 1911486B1 EP 08000914 A EP08000914 A EP 08000914A EP 08000914 A EP08000914 A EP 08000914A EP 1911486 B1 EP1911486 B1 EP 1911486B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- needle
- catheter
- catheter hub
- tip
- guard
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Revoked
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Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M25/00—Catheters; Hollow probes
- A61M25/01—Introducing, guiding, advancing, emplacing or holding catheters
- A61M25/06—Body-piercing guide needles or the like
- A61M25/0612—Devices for protecting the needle; Devices to help insertion of the needle, e.g. wings or holders
- A61M25/0618—Devices for protecting the needle; Devices to help insertion of the needle, e.g. wings or holders having means for protecting only the distal tip of the needle, e.g. a needle guard
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M25/00—Catheters; Hollow probes
- A61M25/01—Introducing, guiding, advancing, emplacing or holding catheters
- A61M25/06—Body-piercing guide needles or the like
- A61M25/0612—Devices for protecting the needle; Devices to help insertion of the needle, e.g. wings or holders
- A61M25/0618—Devices for protecting the needle; Devices to help insertion of the needle, e.g. wings or holders having means for protecting only the distal tip of the needle, e.g. a needle guard
- A61M25/0625—Devices for protecting the needle; Devices to help insertion of the needle, e.g. wings or holders having means for protecting only the distal tip of the needle, e.g. a needle guard with a permanent connection to the needle hub, e.g. a guiding rail, a locking mechanism or a guard advancement mechanism
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/178—Syringes
- A61M5/31—Details
- A61M5/32—Needles; Details of needles pertaining to their connection with syringe or hub; Accessories for bringing the needle into, or holding the needle on, the body; Devices for protection of needles
- A61M5/3205—Apparatus for removing or disposing of used needles or syringes, e.g. containers; Means for protection against accidental injuries from used needles
- A61M5/321—Means for protection against accidental injuries by used needles
- A61M5/3243—Means for protection against accidental injuries by used needles being axially-extensible, e.g. protective sleeves coaxially slidable on the syringe barrel
- A61M5/3245—Constructional features thereof, e.g. to improve manipulation or functioning
- A61M2005/3247—Means to impede repositioning of protection sleeve from needle covering to needle uncovering position
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/178—Syringes
- A61M5/31—Details
- A61M5/32—Needles; Details of needles pertaining to their connection with syringe or hub; Accessories for bringing the needle into, or holding the needle on, the body; Devices for protection of needles
- A61M5/3205—Apparatus for removing or disposing of used needles or syringes, e.g. containers; Means for protection against accidental injuries from used needles
- A61M5/321—Means for protection against accidental injuries by used needles
- A61M5/3243—Means for protection against accidental injuries by used needles being axially-extensible, e.g. protective sleeves coaxially slidable on the syringe barrel
- A61M5/3245—Constructional features thereof, e.g. to improve manipulation or functioning
- A61M2005/3247—Means to impede repositioning of protection sleeve from needle covering to needle uncovering position
- A61M2005/325—Means obstructing the needle passage at distal end of a needle protection sleeve
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/178—Syringes
- A61M5/31—Details
- A61M5/32—Needles; Details of needles pertaining to their connection with syringe or hub; Accessories for bringing the needle into, or holding the needle on, the body; Devices for protection of needles
- A61M5/3205—Apparatus for removing or disposing of used needles or syringes, e.g. containers; Means for protection against accidental injuries from used needles
- A61M5/321—Means for protection against accidental injuries by used needles
- A61M5/3243—Means for protection against accidental injuries by used needles being axially-extensible, e.g. protective sleeves coaxially slidable on the syringe barrel
- A61M5/3273—Means for protection against accidental injuries by used needles being axially-extensible, e.g. protective sleeves coaxially slidable on the syringe barrel freely sliding on needle shaft without connection to syringe or needle
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/178—Syringes
- A61M5/31—Details
- A61M5/32—Needles; Details of needles pertaining to their connection with syringe or hub; Accessories for bringing the needle into, or holding the needle on, the body; Devices for protection of needles
- A61M5/3205—Apparatus for removing or disposing of used needles or syringes, e.g. containers; Means for protection against accidental injuries from used needles
- A61M5/321—Means for protection against accidental injuries by used needles
- A61M5/3243—Means for protection against accidental injuries by used needles being axially-extensible, e.g. protective sleeves coaxially slidable on the syringe barrel
- A61M5/3275—Means for protection against accidental injuries by used needles being axially-extensible, e.g. protective sleeves coaxially slidable on the syringe barrel being connected to the needle hub or syringe by radially deflectable members, e.g. longitudinal slats, cords or bands
Definitions
- the invention relates to an intravenous (IV) catheter
- Such a catheter is known from EP-A-0 554 841 .
- This catheter device comprises a catheter hub attached to the proximal end of a tubular catheter wherein the needle is moveable from a ready position in which the tip of the needle is outside of the catheter hub to a retracted blocking position in which the needle tip is within a needle guard comprising a proximal vertical arm for engaging with a bulge in the shaft of the needle to prevent the removal of the needle from the needle guard, a distal arm engaged by the needle shaft when the needle is in the ready position, wherein a transverse segment of the needle guard connects the proximal arm and the distal arm.
- the distal arm extends from the transverse segment and engages the needle spaced from the needle tip when the needle is in the ready position
- the needle guard is held in a guard housing by means of a bent section of the proximal arm clamped into an opening of the guard housing wherein the distal arm blocks the needle tip in the blocking position within the guard housing
- the guard housing is detachably engaged with the catheter hub wherein the needle guard and the main part of the guard housing is positioned outside of the catheter hub.
- I.V. catheters are primarily used to administer fluids, sometimes containing medications, directly into a patient's vascular system.
- the catheter is inserted into a patient's vein by a health care worker by using a handheld placement device that includes a sharp tip needle.
- the needle is positioned in the interior hollow portion of the catheter with its tip extended slightly beyond the edge of the catheter.
- the end of the apparatus opposite the needle tip is made up of the needle connected to a needle hub which is capable of being held by the health care worker during the insertion procedure.
- the insertion procedure contains four basic steps: (1) the health care worker inserts the needle and catheter together into the patient's vein; (2) after insertion into the vein with the needle point, the catheter is forwarded into the vein of the patient by the health care worker pushing the catheter with his or her finger; (3) the health care worker withdraws the needle by grasping the hub end (opposite the point end) while at the same time applying pressure to the patient's skin at the insertion site with his or her free hand; and (4) the health care worker then tapes the now inverted catheter to the patient's skin and connects the exposed end of the catheter, the catheter hub, to the source of the fluid to be administered into the patient's vein.
- the problem is that immediately after the withdrawal of the needle from the patient's vein, the health care worker who is, at this time, involved in at least two urgent procedures must place the exposed needle tip at a nearby location and address the tasks required to accomplish the needle withdrawal. It is at this juncture that the exposed needle tip creates a danger of an accidental needle stick occurring, which under the circumstances, leaves the health care worker vulnerable to the transmission of various, dangerous blood-borne pathogens, including AIDS and hepatitis.
- the prior art safety catheters all exhibit one or more drawbacks that have thus far limited their usefulness and full acceptance by health-care workers.
- the force required to engage the needle slot within the guard flange is relatively great and would interfere with the removal of the needle. Reducing this force to a more acceptable level would create the possibility of the needle guard remaining in the catheter hub after the needle is removed from the catheter.
- the safety catheter disclosed in the Lemieux patent would not consistently function in a reliable manner.
- the user of the safety catheter disclosed in the Dombrowski patent would have to exert a considerable force to remove the protective cap from the catheter hub, when the cap engages a needle.
- the safety catheter disclosed in the Dombrowski patent would also be relatively expensive to fabricate because of its inclusion of a flexible flange and a tether.
- the McLees protective device requires an irksome, extra pulling action or tug on the needle guard through a retention ring to remove the protected needle from the catheter hub.
- the McLees device also requires the assembly of two separate components and is thus relatively costly to manufacture.
- the needle in the McLees device includes a larger diameter portion near and at the needle tip. This feature of the McLees device would require that the remainder of the needle be of a lesser diameter which would have the adverse effect of slowing the blood flashback through the needle.
- the safety IV catheter of the invention in the embodiment illustrated in Figs. A and 1B, includes a needle hub 12 that includes an axial opening 14 which securely receives the proximal end of a needle 16 having a sharpened tip 18.
- the needle hub 12 as is conventional, is hollow and includes a flash chamber 22.
- the needle 16 is received within a hollow tubular catheter 24, the proximal end of which is concentrically affixed within the distal end of a catheter hub 26 having a distal section 28 and a contiguous, larger diameter proximal section 30.
- the catheter hub 26 terminates at its proximal end in a luer fitting 32 adapted to receive a tubing set, which in a known manner, administers intravenous fluid into the patient.
- the catheter 24 is secured within an axial passageway 34 in distal hub section 28 by means of a sleeve 20 received within passageway 34, which engages the proximal end of the catheter.
- Passageway 34 communicates at its proximal end with a flash chamber 36 formed in hub section 30.
- the distal end of the needle hub 12 is snugly received in the proximal end of the interior of chamber 36 such that the needle 16 extends through the chamber 36, the passageway 34 and distally beyond the catheter hub 26 and catheter 24 so that its tip extends beyond the tapered distal end of the catheter.
- the distal tip of the needle and the catheter are inserted into a patient's vein. Thereafter, the health care practitioner manually places the catheter further into the vein and then withdraws the needle by grasping and moving by hand the proximal end of the needle hub 12. The luer of the catheter hub 26 is then fitted with a source of the fluid that is to be administered into the patient's vein.
- a protective needle guard 40 located within hub chamber 36 automatically snaps into a retracted position in which it blocks access to the distal needle tip and prevents further distal movement of the needle tip, thereby to prevent accidental contact by the health care practitioner with the needle tip.
- the needle guard 40 is in the form of a unitary spring clip that is preferably made of a resilient metal such as stainless steel.
- the spring clip includes a distal arm 42 terminating at its upper end in a curved lip 44, and at its lower end in a pointed end 46, which, in the embodiment of Fig. 1 , is received within a mating groove 48 formed in the lower interior wall of catheter hub section 30.
- the spring clip needle guard 40 further includes a transverse segment 50 that extends upward and proximally from lower pointed end 46 and terminates at a U-shaped upper end 52. In the ready position of the spring clip shown in Fig. 1A , upper end 52 abuts against the upper interior wall of the catheter hub section 30.
- the spring clip guard 40 further includes a vertical arm 54 that extends downward from the U-shaped upper end 52 and terminates above the lower wall of catheter hub section 30.
- Transverse segment 50 and proximal vertical arm 54 respectively include axially aligned openings 56, 58 through which the shaft of needle 16 is free to pass and axially move.
- the diameter of opening 58 is slightly greater than that of the needle shaft, whereas the diameter of the opening 56 is greater than that of opening 58.
- the shaft of needle 16 engages the curved lip 44 of the spring clip needle guard 40, thereby to exert an essentially downward force on the resilient spring clip. That force causes the lower end 46 of the spring clip to seat securely in groove 48 at point a. That contact, in addition to the abutment of the upper end 52 of the spring clip with the upper interior wall at the catheter hub at point b, securely maintains the spring clip needle guard 40 in the ready position within the catheter hub.
- the needle 16 As the needle 16 is retracted to the left, as viewed in Fig. 1A , to its retracted position shown in Fig. 1B , after catheter insertion into the patient's vein, the distal tip of the needle moves proximally past the curved lip 44 of the spring clip needle guard 40 at point c, at which time the downward force previously exerted by the needle shaft on the spring clip is released.
- a bulge 61 is provided whose diameter is greater than that of opening 58 in vertical arm 54. If an attempt is made to move the protected needle illustrated in Fig. 1A in the rearward or proximal direction, bulge 61 will engage wall 54 and will thus not be able to pass through opening 58, so as to prevent further proximal movement of the needle and removal of the needle from the needle guard, as defined.
- a retaining bump can be formed in that wall against which the lower end 46 of the needle guard 42 seats when the needle guard 40 is in the ready position.
- spring clip needle guard 96 when in the ready position illustrated therein, is inserted within catheter hub 26 so as to allow the needle 16 to pass through opening 58 and slot 100.
- the curved end 104 abuts against the inner upper wall of the catheter hub 26 at point b, and curved section 110 seats within the mating groove 48 at point a formed in the lower, inner wall of the catheter hub.
- the lower curved section 108 contacts at a point f the lower, inner wall of the catheter hub 26 at a location proximal to point b.
- the needle is initially withdrawn into the catheter hub until it reaches the position illustrated in Figs. 2B .
- the spring clip remains in contact with the inner wall of the catheter hub at points a, b and f, while the needle tip 18 engages curved end 114, thereby to urge section 110 into groove 48 at point a.
- the relative position of point f with respect to point b prevents the needle and clip from being prematurely released from the catheter hub by preventing the distal end of the clip from tipping upwards and the proximal end from slipping downward with the clip in the position shown in Fig. 2B .
Description
- The invention relates to an intravenous (IV) catheter
- Such a catheter is known from
EP-A-0 554 841 . This catheter device comprises a catheter hub attached to the proximal end of a tubular catheter wherein the needle is moveable from a ready position in which the tip of the needle is outside of the catheter hub to a retracted blocking position in which the needle tip is within a needle guard comprising a proximal vertical arm for engaging with a bulge in the shaft of the needle to prevent the removal of the needle from the needle guard, a distal arm engaged by the needle shaft when the needle is in the ready position, wherein a transverse segment of the needle guard connects the proximal arm and the distal arm. The distal arm extends from the transverse segment and engages the needle spaced from the needle tip when the needle is in the ready position The needle guard is held in a guard housing by means of a bent section of the proximal arm clamped into an opening of the guard housing wherein the distal arm blocks the needle tip in the blocking position within the guard housing The guard housing is detachably engaged with the catheter hub wherein the needle guard and the main part of the guard housing is positioned outside of the catheter hub. - I.V. catheters are primarily used to administer fluids, sometimes containing medications, directly into a patient's vascular system. The catheter is inserted into a patient's vein by a health care worker by using a handheld placement device that includes a sharp tip needle. The needle is positioned in the interior hollow portion of the catheter with its tip extended slightly beyond the edge of the catheter. The end of the apparatus opposite the needle tip is made up of the needle connected to a needle hub which is capable of being held by the health care worker during the insertion procedure.
- The insertion procedure contains four basic steps: (1) the health care worker inserts the needle and catheter together into the patient's vein; (2) after insertion into the vein with the needle point, the catheter is forwarded into the vein of the patient by the health care worker pushing the catheter with his or her finger; (3) the health care worker withdraws the needle by grasping the hub end (opposite the point end) while at the same time applying pressure to the patient's skin at the insertion site with his or her free hand; and (4) the health care worker then tapes the now inverted catheter to the patient's skin and connects the exposed end of the catheter, the catheter hub, to the source of the fluid to be administered into the patient's vein.
- The problem is that immediately after the withdrawal of the needle from the patient's vein, the health care worker who is, at this time, involved in at least two urgent procedures must place the exposed needle tip at a nearby location and address the tasks required to accomplish the needle withdrawal. It is at this juncture that the exposed needle tip creates a danger of an accidental needle stick occurring, which under the circumstances, leaves the health care worker vulnerable to the transmission of various, dangerous blood-borne pathogens, including AIDS and hepatitis.
- This danger to the health care worker from accidental needle sticks has caused an impetus for the development of a safer IV catheter in which the occurrence of such accidental needle sticks is prevented. Safety catheters that have been developed to achieve this result are disclosed, for example, in
Lemieux Reissue Patent No. Re. 34,416 ,Crawford U.S. Patent No. 5,558,651 ,McLees U.S. Patent No. 5,135,504 ,Gaba U.S. Patent No. 5,697,907 , andDombrowski U.S. Patent No. 4,978,344 .Kulli U.S. Patent No. 4,929,241 andChamuel U.S. Patent No. 5,053,017 disclose a protective needle guard for use with a hypodermic needle. - The prior art safety catheters all exhibit one or more drawbacks that have thus far limited their usefulness and full acceptance by health-care workers. For example, in the safety catheter disclosed in the Lemieux patent, the force required to engage the needle slot within the guard flange is relatively great and would interfere with the removal of the needle. Reducing this force to a more acceptable level would create the possibility of the needle guard remaining in the catheter hub after the needle is removed from the catheter. As a result, the safety catheter disclosed in the Lemieux patent would not consistently function in a reliable manner.
- Similarly, the user of the safety catheter disclosed in the Dombrowski patent would have to exert a considerable force to remove the protective cap from the catheter hub, when the cap engages a needle. The safety catheter disclosed in the Dombrowski patent would also be relatively expensive to fabricate because of its inclusion of a flexible flange and a tether.
- The McLees protective device requires an irksome, extra pulling action or tug on the needle guard through a retention ring to remove the protected needle from the catheter hub. The McLees device also requires the assembly of two separate components and is thus relatively costly to manufacture. In addition, the needle in the McLees device includes a larger diameter portion near and at the needle tip. This feature of the McLees device would require that the remainder of the needle be of a lesser diameter which would have the adverse effect of slowing the blood flashback through the needle.
- It is accordingly an object of the present invention to provide a safety IV catheter, which reliably and automatically prevents accidental, inadvertent contact with the needle tip after use.
- It is a further object of the invention to provide a safety catheter which provides reliable protection to the health care practitioner against needle sticks without requiring any change in the manner of use of the safety catheter by the practitioner.
- It is another object of the present invention to provide a safety IV catheter of the type described which is relatively simple and inexpensive to manufacture.
- It is yet a further object of the present invention to provide a safety catheter of the type described in which removal of the needle from the needle guard after use is prevented.
- These objects are achieved by the features in claim 1.
-
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Figs. 1A and 1B are views in partial cross-section of a safety IV catheter in accordance with an embodiment of the invention in the ready and retracted positions, respectively; and -
Figs. 2A and 2B , are views in partial cross-section of a safety IV catheter in accordance with an embodiment of the invention in the ready and retracted positions, respectively. - The safety IV catheter of the invention, generally designated 10, in the embodiment illustrated in Figs. A and 1B, includes a
needle hub 12 that includes anaxial opening 14 which securely receives the proximal end of aneedle 16 having a sharpenedtip 18. Theneedle hub 12, as is conventional, is hollow and includes aflash chamber 22. As is also conventional, theneedle 16 is received within a hollowtubular catheter 24, the proximal end of which is concentrically affixed within the distal end of acatheter hub 26 having adistal section 28 and a contiguous, larger diameterproximal section 30. - The
catheter hub 26 terminates at its proximal end in aluer fitting 32 adapted to receive a tubing set, which in a known manner, administers intravenous fluid into the patient. Thecatheter 24 is secured within anaxial passageway 34 indistal hub section 28 by means of asleeve 20 received withinpassageway 34, which engages the proximal end of the catheter. Passageway 34 communicates at its proximal end with aflash chamber 36 formed inhub section 30. - In the ready position of the catheter shown in
Fig. 1A , the distal end of theneedle hub 12 is snugly received in the proximal end of the interior ofchamber 36 such that theneedle 16 extends through thechamber 36, thepassageway 34 and distally beyond thecatheter hub 26 andcatheter 24 so that its tip extends beyond the tapered distal end of the catheter. - In use, the distal tip of the needle and the catheter are inserted into a patient's vein. Thereafter, the health care practitioner manually places the catheter further into the vein and then withdraws the needle by grasping and moving by hand the proximal end of the
needle hub 12. The luer of thecatheter hub 26 is then fitted with a source of the fluid that is to be administered into the patient's vein. - In accordance with the present invention, as the
needle 16 is being withdrawn from the patient, aprotective needle guard 40 located withinhub chamber 36 automatically snaps into a retracted position in which it blocks access to the distal needle tip and prevents further distal movement of the needle tip, thereby to prevent accidental contact by the health care practitioner with the needle tip. - As shown in
Figs. 1A and 1B , theneedle guard 40 is in the form of a unitary spring clip that is preferably made of a resilient metal such as stainless steel. The spring clip includes adistal arm 42 terminating at its upper end in acurved lip 44, and at its lower end in apointed end 46, which, in the embodiment ofFig. 1 , is received within amating groove 48 formed in the lower interior wall ofcatheter hub section 30. - The spring
clip needle guard 40 further includes atransverse segment 50 that extends upward and proximally from lowerpointed end 46 and terminates at a U-shapedupper end 52. In the ready position of the spring clip shown inFig. 1A ,upper end 52 abuts against the upper interior wall of thecatheter hub section 30. Thespring clip guard 40 further includes avertical arm 54 that extends downward from the U-shapedupper end 52 and terminates above the lower wall ofcatheter hub section 30.Transverse segment 50 and proximalvertical arm 54 respectively include axially alignedopenings needle 16 is free to pass and axially move. The diameter of opening 58 is slightly greater than that of the needle shaft, whereas the diameter of theopening 56 is greater than that of opening 58. - In the ready position of the catheter prior to needle withdrawal, the shaft of
needle 16 engages thecurved lip 44 of the springclip needle guard 40, thereby to exert an essentially downward force on the resilient spring clip. That force causes thelower end 46 of the spring clip to seat securely ingroove 48 at point a. That contact, in addition to the abutment of theupper end 52 of the spring clip with the upper interior wall at the catheter hub at point b, securely maintains the springclip needle guard 40 in the ready position within the catheter hub. - As the
needle 16 is retracted to the left, as viewed inFig. 1A , to its retracted position shown inFig. 1B , after catheter insertion into the patient's vein, the distal tip of the needle moves proximally past thecurved lip 44 of the springclip needle guard 40 at point c, at which time the downward force previously exerted by the needle shaft on the spring clip is released. - As a result of the
needle 16 moving proximally past point c, the retention force on springclip needle guard 40 in the catheter hub is released causing the springclip needle guard 40 to pivot or snap in a clockwise direction to the retracted position shown inFig. 1B . As therein shown,distal arm 42 of theneedle guard 40 blocks the distal path of theneedle 16. - In the needle shaft a
bulge 61 is provided whose diameter is greater than that of opening 58 invertical arm 54. If an attempt is made to move the protected needle illustrated inFig. 1A in the rearward or proximal direction,bulge 61 will engagewall 54 and will thus not be able to pass through opening 58, so as to prevent further proximal movement of the needle and removal of the needle from the needle guard, as defined. - Instead of the groove formed in the lower wall of the catheter hub that engages the lower end of the spring clip, a retaining bump can be formed in that wall against which the
lower end 46 of theneedle guard 42 seats when theneedle guard 40 is in the ready position. - As shown in
Fig. 2A , springclip needle guard 96, when in the ready position illustrated therein, is inserted withincatheter hub 26 so as to allow theneedle 16 to pass through opening 58 andslot 100. Thecurved end 104 abuts against the inner upper wall of thecatheter hub 26 at point b, andcurved section 110 seats within themating groove 48 at point a formed in the lower, inner wall of the catheter hub. In addition, the lowercurved section 108 contacts at a point f the lower, inner wall of thecatheter hub 26 at a location proximal to point b. - In operation, the needle is initially withdrawn into the catheter hub until it reaches the position illustrated in
Figs. 2B . At this point, the spring clip remains in contact with the inner wall of the catheter hub at points a, b and f, while theneedle tip 18 engagescurved end 114, thereby to urgesection 110 intogroove 48 at point a. The relative position of point f with respect to point b prevents the needle and clip from being prematurely released from the catheter hub by preventing the distal end of the clip from tipping upwards and the proximal end from slipping downward with the clip in the position shown inFig. 2B . - As the needle is withdrawn further away from the patient, the needle tip passes beyond
curved end 114, thereby releasing the downward force that had been previously exerted oncurved end 114 by the needle. - This sudden release of the downward force on the spring clip end causes the distal end of the
spring clip 96 to pivot upward so thatdistal end 112 ofspring clip 96 moves rapidly to a position in which it prevents or blocks motion of the needle in the distal direction. Thespring clip 96 is retained on theneedle 16 and will be removed from thecatheter hub 26 when the needle is completely removed. Movement of thespring clip 96 from its protecting or retracted position is further prevented by abulge 61 whose diameter is greater than that of opening 58 invertical arm 54. If an attempt is made to move the protected needle illustrated inFig. 2A in the rearward or proximal direction,bulge 61 will engagewall 54 and will not be able to pass through opening 58, so as to prevent any further proximal movement of the needle and removal of the needle from the needle guard, as desired.
Claims (1)
- An IV catheter including:a tubular catheter (24);a needle (16) having a needle shaft and a tip, said needle being received within said tubular catheter (24) when in a ready position, the needle comprising a bulge (61) in its shaft;a catheter hub (26) attached to the proximal end of said tubular catheter (24), said catheter hub having a hollow interior enclosed by an interior wall (36);said needle being movable from said ready position in which said tip is outside of said catheter hub (26) to a retracted blocking position in which said tip is within the interior of said catheter hub (26),a needle guard comprising:a proximal vertical arm (54, 106) engaging with the bulge (61) in the shaft of the needle to prevent the removal of the needle from the needle guard (96, 40);a distal aim (42, 112) engaged by said needle shaft when said needle is in said ready position;a section (46) of a transverse segment (50, 98) of said needle guard (96, 40) connecting the proximal vertical arm (54, 106) and the distal arm (42, 112) and being urged by said needle shaft into retaining relation within said catheter hub (26) when said needle is in the ready position;said distal arm (42, 112) extending from said transverse segment (98) and engaging the needle spaced from said needle tip when said needle is in said ready position and movable within the interior of said catheter hub to the blocking position distal of said needle tip when said needle is in its retracted position;the engaging of the needle and the urging of said section of the transverse segment (50, 98) into retaining relation with the catheter hub in the ready position being both achieved by engagement of the distal arm (42, 112) of the needle guard with the needle shaft;said section (46) of said transverse segment (50, 98) being a curved section in retaining contact with the interior wall (36) of the catheter hub (26), for providing engagement of the needle guard (96, 40) when transitioning from the ready position to the blocking position at a fixed longitudinal position within the catheter hub
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US91514897A | 1997-08-20 | 1997-08-20 | |
US09/097,170 US6117108A (en) | 1997-08-20 | 1998-06-12 | Spring clip safety IV catheter |
EP04000853A EP1421969B1 (en) | 1997-08-20 | 1998-08-18 | Spring clip as needle protection for a saftey IV catheter |
EP98948843A EP1003588B1 (en) | 1997-08-20 | 1998-08-18 | Spring clip as needle tip protection for a safety iv catheter |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04000853A Division EP1421969B1 (en) | 1997-08-20 | 1998-08-18 | Spring clip as needle protection for a saftey IV catheter |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1911486A1 EP1911486A1 (en) | 2008-04-16 |
EP1911486B1 true EP1911486B1 (en) | 2009-10-07 |
Family
ID=26792794
Family Applications (7)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04000853A Expired - Lifetime EP1421969B1 (en) | 1997-08-20 | 1998-08-18 | Spring clip as needle protection for a saftey IV catheter |
EP10012849.5A Expired - Lifetime EP2316512B9 (en) | 1997-08-20 | 1998-08-18 | Spring clip as needle tip protection for a safety IV catheter |
EP98948843A Expired - Lifetime EP1003588B1 (en) | 1997-08-20 | 1998-08-18 | Spring clip as needle tip protection for a safety iv catheter |
EP08000914A Revoked EP1911486B1 (en) | 1997-08-20 | 1998-08-18 | Spring clip as needle tip protection for a safety IV catheter |
EP06013843A Revoked EP1702643B1 (en) | 1997-08-20 | 1998-08-18 | Spring clip as needle tip protection for a safety IV catheter |
EP08000915.2A Revoked EP1911487B1 (en) | 1997-08-20 | 1998-08-18 | Spring clip as needle tip protection for a safety IV catheter |
EP10012850.3A Revoked EP2338554B1 (en) | 1997-08-20 | 1998-08-18 | Spring clip as needle tip protection for a safety IV catheter |
Family Applications Before (3)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04000853A Expired - Lifetime EP1421969B1 (en) | 1997-08-20 | 1998-08-18 | Spring clip as needle protection for a saftey IV catheter |
EP10012849.5A Expired - Lifetime EP2316512B9 (en) | 1997-08-20 | 1998-08-18 | Spring clip as needle tip protection for a safety IV catheter |
EP98948843A Expired - Lifetime EP1003588B1 (en) | 1997-08-20 | 1998-08-18 | Spring clip as needle tip protection for a safety iv catheter |
Family Applications After (3)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP06013843A Revoked EP1702643B1 (en) | 1997-08-20 | 1998-08-18 | Spring clip as needle tip protection for a safety IV catheter |
EP08000915.2A Revoked EP1911487B1 (en) | 1997-08-20 | 1998-08-18 | Spring clip as needle tip protection for a safety IV catheter |
EP10012850.3A Revoked EP2338554B1 (en) | 1997-08-20 | 1998-08-18 | Spring clip as needle tip protection for a safety IV catheter |
Country Status (12)
Country | Link |
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US (2) | US6117108A (en) |
EP (7) | EP1421969B1 (en) |
JP (2) | JP3486169B2 (en) |
CN (3) | CN100584401C (en) |
AR (1) | AR013430A1 (en) |
AU (1) | AU730988B2 (en) |
BR (1) | BR9812128F8 (en) |
DE (4) | DE69841231D1 (en) |
ES (7) | ES2224915T3 (en) |
HK (1) | HK1108658A1 (en) |
WO (1) | WO1999008742A1 (en) |
ZA (1) | ZA987377B (en) |
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1998
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